Steam-valve.



J. D. THEOOP.

Patented Mar. 30, 1909.

1 TTORNE Y5 UNITED STATES JOHN D. THROOP, OF DETROIT, MICHIGAN.

STEAM-VALVE.

Specification of Letters Patent.

Application filed November 16, 1906.

Patented March 30, 1909.

Serial No. 343.766.

To all whom 'it may comm-m.

file it known that I, Jonzv l). 'liniooe, a citizen of the United States. residing at Detroit, in the county of Vlayne and State of Michigan, have invented a new and useful Steam-Valve, of ivhich the following is a specification.

The present invention relates to a valve of that type requiring no stnfiing box or packing around the stem where it passes through the casing.

The invention has for one of its objects :to provide a valve of this character in which the parts are of comparatively simple and inexpensive construction and designed to be quickly and conveniently assembled or taken :1 )art, and to be thoroughly reliable and e cient in operation.

A further object of: the invention is the provision of a valve Having aground joint between the valvestem and bonnet of the easin and a spring for holding the parts tight i seated with a ball bearing between the spring and bonnet so as to permit the swing to be rotated with comparatively little friction.

Another object is to construct the valve with a non-longitudinally movable valve stem which operates through a nut to move the valve toward or away from its seat, a flexible joint being provided between the nut and valve for facilitating the proper seatin of the latter.

lV it these objects in view, and others, as will appear as the nature of the invention is better understood, the invention comprises the various novel features of construction and arrangement of parts, which will be more fully described hereinafter and set forth with particularity in the claim appended hereto.

In the accompanying drawing, which illustrates one of the embodiments of the invention, Figure 1 is a central vertical section of the valve. Fig. 2 is a transverse sec; tion taken on line 22, Fig. 1.

Corresponding parts in the several figures are indicated throughout by similar characters of reference.

Referring to the drawing. 1 designates the valve casing which is of ordinary construction having a tapped inlet o iiening 2 and an outlet opening 3, and provided with a partition 4 having a port 5. The top of the valve casing is open and provided with an interior thread at6 for receiving the bonnet T. llxlendi ng through the bonnet T is the rotatable valve. stem 8 provided at its upper end with a hand wheel 9 suitably cured thereto and having at its lower end a square scre w thread 10. Engaging the thread 10 is u non-rotatable nut 11 to which the valve 1'2 is attached. The nut 11 is provided with two diametrical longitudinally extending wings or ribs 13 which slidably en age in vcrticallv extending grooves 14 provided in the guides or depending projections 15 onthe inner end of the bonnet 7. By this means. the nut is prevented from rotating. but is free to move vertically as the stem 8 is rotated.

In 01 der -'to dispense with the usual paolc ing rings, or stulfing box, a conical seat 16 is formed on the bonnet adjacent the bottom thereof -with which cooperates a conical enlargement 17 on the who stem. The seat and enlargement are carefully groninl, so that the joint between them will be perfectl tinid tight. An annular shoulder 18 is provided at the lower end of the bore 19 of the bonnet just above the seat 16. which shoulder forms an abutment for the lower end of the helical compression spring 20 that is disposed in the bore 19 and around the valve stem. The abutment tor the upper end of the spring is formed by a collar 21 removnbly secured to the stem by the. pin 22. Arranged on the top end of the bonnet is a screw cap 23, the periphery of which is noneircular, as is also the periphery of the bonnet at 24, for the reception of the wrench. Interposed between the shoulder 18 and the lower end of the spring 20 is a. ball bearing 25 for permitting the spring to move with the valve stem without undue friction at the shoulder 1d. By this arrangement, the spring 520. which is ntn'mally under a suitable tension. holds the annular enlargement 17 on the valve stem tightly against the seat 16, thus forming a seal or packing for preventing the escape of steam or other fluid, and at the same time permitting the valve stem to rotate freely.

The valve proper. designated by 12. comprises a dislcshaped body 96 having a cylindrical depending flange 27 forming, with the bottom side of the body. a holder for the leather rin or other packing 28. The body is prrivided with a central threaded stud 29 extending downuzodlv ihroughthe packing I ring 28 and receiving a nut 30 for holding 1 the pack-lug in place. On the top of the body 26 is a hollow boss 31 into which extends the head 32 formed on the lower end of the nut it. The bottom of the hollow boss is sli htly eoueave, and the bottom surface of the end is slightly convex, so that the valve will be rapahle of having a limited curvilinear movement on the nut independently of the latter, so that the valve can be properly seated on the port 5. The valve is supported on the head 32 in any suitable manner, as, for instance, by means of pins 33 extending through the boss 31 and. engaging on the top side of the head of the nut. By this consl rnel ion, a flexible joint is provided between the valve and the actuating nut 11 which permits the alve to seat properly and to rock iude 'iendently of the nut, as when the former is almost seated or in frictional engagemcnt with its seat.

FlUltl the foregoing description, taken in ronneetion with the accompanying drawing, the advantages-of the construction and of the operation will be readily understood. The operation of the valve is attended with practically no leakage, and since no packings are employed wear of the valve extremely small. The parts are so designed that they can be readily assembled or disassembled for the purpose of inspection, renewal or repair 0 of the valve. as occasion requires.

l have described the principle of operation name of the invention, to ether with the apparatus which I now consi er to be the best embodiment thereof, but I desire to have it understood that the apparatus shown is merely illustrative, and t at various changes may be made, when desired, as are within the scope of the invention.-

What is claimed is:-

In a valve, a casing having a port, a stem, at bonnet having a conical seat and a shoulder above the seat, a cortical enlargement on the stem engaging the seat, a spring in the honnet and extending around the stem, antifrietion bearings between one end of the spring and the shoulder of the bonnet, a collar on the stem to form an abutment for the other end of the spring, a screw on the stem, a member actuated by the screw to move in a direction longitudinally thereof, a valve haviuga rocking connection with the mem-.

her and eoacting with the port, and means on the bonnet for guiding the movement of the member.

In testimony that I claim the foregoing as my own, I have hereto aflixed my signature in the preseuee of two witnesses.

JOHN D. THROOP.

Witnessesi W. W. SMITH, JruA KEATS. 

